What Is FHO Surgery? Femoral Head Ostectomy Explained

If your dog or cat has been diagnosed with a painful hip condition, your veterinarian may bring up FHO surgery, short for femoral head ostectomy. It is an orthopedic procedure used to relieve pain and restore movement in pets dealing with hip dysplasia, trauma, or long-standing joint degeneration. It suits small to medium dogs and cats particularly well, and results are often excellent when rehabilitation is part of the plan.

Here is what the surgery involves, when it gets recommended, and what happens afterward.

Why the Hip Sometimes Needs This Surgery

The hip is a ball-and-socket joint. The rounded head of the femur is the ball, and it sits in the acetabulum of the pelvis, the socket. In a healthy pet, cartilage lines that joint and lets it move smoothly and without pain.

Trauma, joint disease, or a developmental disorder can damage that cartilage or throw the joint out of alignment. What follows is bone contacting bone, ongoing inflammation, limping or lameness, and pain that shows up most when the pet bears weight or gets up.

FHO addresses this by removing the femoral head and neck. Once they are gone, the body builds a pseudoarthrosis, a false joint made of scar tissue. That false joint ends the direct bone-on-bone contact and helps restore comfortable function, particularly in animals weighing less than 50 pounds.

When Veterinarians Recommend It

FHO is considered a salvage procedure. The goal is not to recreate a natural joint but to give the pet functional, pain-free movement. It is typically recommended for:

• Hip dysplasia that no longer responds to medical management
• Chronic dislocations that are unstable or painful
• Fractures involving the femoral head or neck
• Legg-Calve-Perthes disease, seen commonly in small breed dogs
• Severe arthritis that limits everyday function

It is also frequently chosen as a cost-effective alternative to total hip replacement, which may not be workable because of finances, patient size, or other medical concerns. Smaller pets in particular adapt readily to a pseudoarthrosis. FHO is performed often, especially in referral settings and in general practices that work with mobile surgical teams.

The Workup Before Surgery

Before scheduling anything, your veterinarian will run a full orthopedic evaluation to see whether your pet is a good candidate. That may include:

• A physical examination and gait analysis
• Palpation to check for joint instability, pain, or muscle atrophy
• Radiographs of the hips and pelvis
• Basic bloodwork to assess organ function and anesthetic safety

Results tend to be best in pets with a lean body condition and good muscle tone in the hind limb. Pets over 50 pounds can still benefit, but outcomes vary more and often depend on committed rehab work and on how well that individual animal adapts.

Which Pets Do Best

FHO is most successful in cats, who typically recover with excellent outcomes; in small to medium dogs under 50 pounds; in pets with good hind limb strength and muscle mass; and with owners who are willing to take part in rehabilitation.

In larger breed dogs, FHO can still be an option when other choices are not viable. Some mild limping or reduced range of motion may remain, but many large dogs still gain meaningful pain relief and better function. Your veterinarian will weigh age, weight, general health, and activity level in making the call.

Recovery and Rehabilitation

Every pet heals differently, and protocols vary by case and by surgeon. Rather than measuring your pet against a rigid week-by-week chart you found online, follow the instructions your own veterinarian gives you.

In the period right after surgery, expect pain medication or anti-inflammatories, possibly antibiotics, and sometimes sedatives to keep your pet from damaging the surgical site. Exercise restrictions will be spelled out in the discharge instructions.

Restricting activity does not mean total stillness. Gentle walking around a small area on non-slip flooring helps the joint heal. What it rules out is long walks outside the home and any running, jumping, or hard play, which can harm the surgical site instead of helping it. This applies to both dogs and cats.

Once the incision has healed, gradual movement is encouraged to head off stiffness and muscle loss. Depending on availability and your pet's temperament, that may include supervised leash walking, passive range-of-motion exercises at home, and underwater treadmill therapy. Some veterinarians or rehab therapists add cold laser therapy or a structured exercise routine. Early use of the limb is strongly encouraged, as long as it is controlled and not painful.

The Long-Term Picture

The aim of FHO is to end the pain and let the leg work. Pets will not have a normal hip joint afterward, but the great majority regain full or nearly full use of the leg, especially with rehabilitation. Many return to comfortable walking, running, and play. Some mild muscle loss or stiffness can persist, and a slight gait difference is possible, particularly in large dogs. Because the joint itself is gone, hip arthritis does not return there.

Owners often describe their pets as noticeably happier, more playful, and more willing to move after the procedure, especially pets who had been living with chronic hip pain. Cats and small dogs tend to recover exceptionally well, while larger breeds usually need a more involved rehab plan but still show real improvement. If your pet has been diagnosed with a hip problem, talk through the options with your veterinarian, who can tell you whether FHO fits your animal.